Biochemical analysis of TOPBP1 oligomerization.

Biochemical analysis of TOPBP1 oligomerization.
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DOI:
10.1016/j.dnarep.2020.102973
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发表时间:
2020-12
期刊:
影响因子:
3.8
通讯作者:
Michael WM
Michael WM
中科院分区:
医学3区
文献类型:
--
作者:
Kim A;Montales K;Ruis K;Senebandith H;Gasparyan H;Cowan Q;Michael WM

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TOPBP1是一种重要的支架蛋白,有助于协调细胞对DNA损伤的反应。虽然以前已经认识到TOPBP1可以形成低聚物,但这是如何发生的以及低聚化的功能后果尚不清楚。在这里,我们使用蛋白质结合试验和其他生化技术来研究TOPBP1如何自我结合。TOPBP1包含9个BRCT结构域拷贝,我们报道这些BRCT结构域的一个子集彼此相互作用以驱动寡聚化。完整的BRCT 2结构域是TOPBP1寡聚化的必要条件,我们发现TOPBP1的BRCT1&2区域与自身以及BRCT4&5对相互作用。RAD9和RHINO是TOPBP1 BRCT 1和2结构域的两个异源结合伙伴,我们发现这些合作伙伴的结合并不以TOPBP1寡聚化为代价。此外,我们发现TOPBP1寡聚物可以同时与RAD9和RHINO相互作用。最后,我们发现TOPBP1激活ATR蛋白激酶所需的低聚物状态可能是一个四聚体。
TOPBP1 is an important scaffold protein that helps orchestrate the cellular response to DNA damage. Although it has been previously appreciated that TOPBP1 can form oligomers, how this occurs and the functional consequences for oligomerization were not yet known. Here, we use protein binding assays and other biochemical techniques to study how TOPBP1 self associates. TOPBP1 contains 9 copies of the BRCT domain, and we report that a subset of these BRCT domains interact with one another to drive oligomerization. An intact BRCT 2 domain is required for TOPBP1 oligomerization and we find that the BRCT1&2 region of TOPBP1 interacts with itself and with the BRCT4&5 pair. RAD9 and RHINO are two heterologous binding partners for TOPBP1’s BRCT 1&2 domains, and we show that binding of these partners does not come at the expense of TOPBP1 oligomerization. Furthermore, we show that a TOPBP1 oligomer can simultaneously interact with both RAD9 and RHINO. Lastly, we find that the oligomeric state necessary for TOPBP1 to activate the ATR protein kinase is likely to be a tetramer.
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